Drag type wheel finishing machine

ABSTRACT

A drag type wheel finishing machine. A spindle is connected to an output shaft of a drive motor secured to an upper platform of a frame structure. Arms are mounted adjacent to a lower end of the spindle. Upright members are joined to distal ends of the arms. Wheel mounting parts are mounted to lower ends of the upright members, and an abrasive polishing media bath is placed in the frame structure to be raised and lowered by a lift mechanism. The lift mechanism is configured such that the media bath can be guided by four columns and supported by four wires. One ends of the wires are connected to a distal end of a piston rod of a drag type hydraulic cylinder installed on the media bath such that, when the wires are simultaneously pulled via the piston rod, the media bath is raised.

TECHNICAL FIELD

[0001] The present invention relates, in general, to a drag type wheelfinishing machine which polishes the surfaces of automobile wheels,almost perfectly and, more particularly, to a drag type wheel finishingmachine which polishes and finishes surfaces of automobile wheels usingfriction between the surfaces and abrasive polishing media by revolvingand rotating the automobile wheels, with a plurality of wheels fully orpartially submerged in the abrasive polishing media accommodated in amedia bath, thereby rendering a smooth and aesthetically impressiveappearance.

BACKGROUND ART

[0002] The popularity of stylized automobile wheels has been largelyattributable to their aesthetic enhancement of automobiles, with chromewheels in particular providing a more stylish, sporty, and expensivelook. In order to provide such an aesthetically pleasing appearance, thesurface of a wheel must be as smooth as possible before it is coated orplated with a layer of chrome. If the surface is not smooth, the chromelayer applied thereto acts to enhance and magnify any grooves orimperfections remaining on the wheel surface. In the case that theplated chrome layer is exfoliated around a groove, the generalappearance of the wheel is significantly detracted.

[0003] Thus, there is a need for a device which may quickly andefficiently remove substantially all grooves and roughness on thesurface of a wheel to provide the surface with the desired degree ofsmoothness.

[0004] A wheel finishing machine related with this technique isdisclosed in U.S. Pat. No. 6,406,356. In this conventional wheelfinishing machine, an abrasive polishing media bath is installed oncolumns of a frame in a manner such that it can be raised and lowered bytwo hydraulic cylinders. A plurality of arms are mounted to a lower endof a vertical spindle which receives power from a drive motor secured toan upper platform of the frame. Upright members, which have wheelmounting shafts at lower ends of them, extend downward from the distalends of the arms, respectively. The upright members are structured sothat they can be rotated with respect to the arms in the range of apredetermined angle.

[0005] The conventional wheel finishing machine constructed as mentionedabove suffers from defects as described below.

[0006] First, due to the fact that the media bath is raised and loweredby the two hydraulic cylinders while being guided by the four columns ofthe frame, it is technically difficult to stably maintain the balance ofthe media bath, and therefore, the probability of the media bath beingtilted to one side is increased.

[0007] Second, while the wheel mounting shafts of the. upright membersextending downward from the distal ends of the arms rotated integrallywith the spindle can be rotated to less than ninety degrees to therebybe adjusted in its angle with respect to the arms, since the angleadjustment can be implemented only on a horizontal plane, frictionbetween the abrasive polishing media and the wheels cannot beeffectively increased as desired.

[0008] Third, because a hinged door is installed on the media bath toallow the wheels to be easily submerged in the media bath and a separatearrangement for preventing leakage of water is not provided, in a statewherein the wheels are mounted to the wheel mounting shafts coupled tothe lower ends of the upright members, when the media bath is raised andthe spindle is rotated to polish and finish the wheels, a problem iscaused in that water leaks between the media bath and the hinged door.

[0009] Fourth, in the conventional wheel finishing machine, any meansfor mounting the wheels moved adjacent to the frame structure to thewheel mounting shafts coupled to the lower ends of the upright membersis not provided. Thus, notwithstanding each of the wheels has arelatively heavy weight, the wheels cannot but be manually mounted tothe wheel mounting shafts, and hence, the wheel mounting procedure hasproved to be quite tedious, time-consuming, laborious, and thus, verycostly.

DISCLOSURE OF THE INVENTION

[0010] Accordingly, an object of the present invention is to solve theabove-described problems occurring in the prior art.

[0011] In order to achieve the above object, according to one aspect ofthe present invention, there is provided a drag type wheel finishingmachine in which a spindle extending downward is connected to androtated integrally with a velocity-reduced output shaft of a drive motorsecured to an upper platform of a frame structure, a plurality of armshorizontally extending in respective four directions are mountedadjacent to a lower end of the spindle, upright members are joined torespective distal ends of the arms to extend downward, wheel mountingparts for mounting wheels are mounted to respective lower ends of theupright members, and an abrasive polishing media bath is placed in theframe structure to be raised and lowered by a lift mechanism, whereinthe lift mechanism of the abrasive polishing media bath is configured ina manner such that the abrasive polishing media bath can be raised andlowered while being guided by four columns and supported by four wiresextending downward from upper ends of the respective columns, andwherein one ends of the wires are connected to a distal end of a pistonrod of a drag type hydraulic cylinder installed on the abrasivepolishing media bath in a manner such that, when the wires aresimultaneously pulled via the piston rod, the abrasive polishing mediabath is raised.

[0012] According to another aspect of the present invention, the armsand the upright members are connected with each other by pins in amanner such that the upright members can be pivoted relative to thearms, and upright hydraulic cylinders connect the upright members to thearms in a manner such that the upright members can be adjusted in theirrespective angular positions.

[0013] According to another aspect of the present invention, a slidingdoor is installed on the abrasive polishing media bath to be guided in acircumferential direction while being opened and closed, upper and lowerguide walls are formed on the abrasive polishing media bath to receiveupper and lower ends of the sliding door, respectively, the lower guidewall has a Y-shaped section which has a hole for allowing water that hasoverflowed onto the lower guide wall to be returned into the abrasivepolishing media bath, and a flexible seal strip to be brought intocontact with the sliding door is affixed to an inner surface of theabrasive polishing media bath to reduce an amount of water overflowingonto the lower guide wall.

[0014] According to another aspect of the present invention, rotationwings are formed on the lower end of the spindle and extend downward toreach the same level as the lower ends of the upright members, in amanner such that, when the wheels mounted to the wheel mounting parts ofthe upright members are rotated, abrasive polishing media collectedtoward a center of the abrasive polishing media bath can bere-distributed in all directions.

[0015] According to still another aspect of the present invention, theupper platform of the frame structure is provided with a wheel mountingcrane for mounting and dismounting the respective wheels to and from thewheel mounting parts; and the wheel mounting crane comprises a firstrotation shaft installed on the upper platform to be capable of beinghorizontally rotated in both directions, a first horizontal leverfastened at one end thereof to the first rotation shaft to extend in ahorizontal direction, a second rotation shaft installed on the other endof the first horizontal lever to be capable of being horizontallyrotated in both directions, a second horizontal lever fastened at oneend thereof to the second rotation shaft and provided with a cylinder, apulley connected to a distal end of a piston rod of the cylinderadjacent to the other end of the second horizontal lever, and a wheeldragging wire having one end which is secured to the second horizontallever and the other end which is connected to a wheel hanger, the wheeldragging wire wound on the pulley and extending downward from the otherend of the second horizontal lever.

[0016] According to yet still another aspect of the present invention,the upper platform of the frame structure is provided with a wheelmounting crane for mounting and dismounting the respective wheels to andfrom the wheel mounting parts; and the wheel mounting crane comprises acrane body arranged on the upper platform to be capable of beinghorizontally rotated in both directions, a quadric wheel moving leverinstalled on the crane body to be pivoted in upward and downwarddirections, a crane cylinder secured to the crane body to pivot thewheel moving lever in the upward and downward directions, and a wheelgripper provided to a distal end of the wheel moving lever toselectively grip the wheels.

BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other objects, features and other advantages of thepresent invention will be more clearly understood from the followingdetailed description when taken in conjunction with the accompanyingdrawings, in which:

[0018]FIG. 1 is a front view illustrating a drag type wheel finishingmachine in accordance with an embodiment of the present invention;

[0019]FIG. 2 is a side view of the drag type wheel finishing machineshown in FIG. 1;

[0020]FIG. 3 is a transverse sectional view of the drag type wheelfinishing machine according to the present invention;

[0021]FIG. 4 is a perspective view independently illustrating a liftmechanism for raising and lowering a media bath, which serves as onemain component element of the drag type wheel finishing machineaccording to the present invention;

[0022]FIG. 5 is a partial enlarged view illustrating a lower part of aspindle;

[0023]FIG. 6 is a partial enlarged view illustrating a wheel mountingcrane in the drag type wheel finishing machine according to the presentinvention;

[0024]FIG. 7 is a partial enlarged view illustrating a door part in thedrag type wheel finishing machine according to the present invention;and

[0025]FIG. 8 is a partial enlarge view illustrating a variation of thewheel mounting crane in the drag type wheel finishing machine accordingto the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

[0026] Reference will now be made in greater detail to a preferredembodiment of the invention, an example of which is illustrated in theaccompanying drawings. Wherever possible, the same reference numeralswill be used throughout the drawings and the description to refer to thesame or like parts.

[0027]FIGS. 1 through 7 are views illustrating a drag type wheelfinishing machine in accordance with a preferred embodiment of thepresent invention.

[0028] As shown in the drawings, the drag type wheel finishing machineincludes a frame structure 10. The frame structure 10 possessessubstantially a quadrangular box-shaped configuration. The framestructure 10 has four columns 12 which are erected at four corners,respectively, of the frame structure 10. An upper platform 13 isprovided to upper ends of the columns 12. A drive motor 20 having areduction gear box 21 is secured to the upper platform 13. The drivemotor 20 and the reduction gear box 21 constitute one unit. A spindle 22is coupled to a velocity-reduced output shaft of the reduction gear box21 to extend downward.

[0029] Below the upper platform 13, four arms 23 are mounted adjacent toa lower end of the spindle 22 to extend in a horizontal direction.Upright members 24 are connected to distal ends of the arms 23 by meansof pins 25 to extend downward. Upright hydraulic cylinders 26 alsoconnect the arms 23 and the upright members 24 with each other to allowfor angular adjustments of the upright members 24. Wheel mounting parts27 for mounting wheels designated by the reference character ‘w’ aremounted to respective lower ends of the upright members 24.

[0030] An extended portion 22 a is formed on the lower end of thespindle 22 and extends downward to reach the same level as the lowerends of the upright members 24. Rotation wings 22 b are formed on theextended portion 22 a in a manner such that, when the wheels ‘w’ mountedto the wheel mounting parts 27 of the upright members 24 are rotated,abrasive polishing media collected toward a center of an abrasivepolishing media bath 30 can be re-distributed in all directions.

[0031] A lift plate 31 is installed in the frame structure 10 in amanner such that the lift plate 31 can be raised and lowered by a liftmechanism while being guided along the columns 12. The abrasivepolishing media bath 30 is securely inserted through the lift plate 31.The abrasive polishing media bath 30 has a bottom end which is convexeddownward and a top end which is opened.

[0032] As can be readily seen from FIG. 7, a pair of arc-shaped slidingdoors 32 are provided at one side of the top end of the abrasivepolishing media bath 30 in a manner such that they can be opened andclosed in a circumferential direction of the abrasive polishing mediabath 30. Upper and lower guide walls 33 a and 33 b are formed on theabrasive polishing media bath 30 to receive upper and lower ends of thesliding doors 32, respectively. The lower guide wall 33 b has a Y-shapedsection which has a hole 34 for allowing water overflowed onto the lowerguide wall 33 b to be returned into the abrasive polishing media bath30. A flexible seal strip 35 to be brought into contact with the slidingdoors 32 is affixed to an inner surface of the abrasive polishing mediabath 30 by means of a fastener strip 36 to reduce an amount of wateroverflowing onto the lower guide wall 33 b.

[0033] As shown in FIG. 4, in the lift mechanism of the abrasivepolishing media bath 30, a drag type hydraulic cylinder 37 having apiston rod 37 a is installed on the lift plate 31 in a horizontaldirection. Four wires 38 a through 38 d are connected at one endsthereof to a distal end of the piston rod 37 a of the drag typehydraulic cylinder 37 and at the other. ends thereof to the upper endsof the columns 12. At this time, the lift plate 31 must be appropriatelysupported in a manner such that the abrasive polishing media bath 30 canbe raised and lowered when the piston rod 37 a of the drag typehydraulic cylinder 37 is operated to simultaneously pull and release theone ends of the respective wires 38 a through 38 d.

[0034] A wheel mounting crane 40 is provided on the upper platform 13 atone side of the frame structure 10, in a manner such that the wheels ‘w’moved adjacent to the frame structure 10 can be easily mounted to thewheel mounting parts 27 coupled to the lower ends of the upright members24, and the wheels ‘w’ having undergone a polishing and finishingoperation can be easily dismounted form the wheel mounting parts 27.

[0035] As best shown in FIG. 6, in the wheel mounting crane 40, a firstrotation shaft 41 is installed on the upper platform 13 to be capable ofbeing horizontally rotated in both directions, and a first horizontallever 42 is fastened at one end thereof to the first rotation shaft 41to extend in a horizontal direction. A second rotation shaft 43 isinstalled on the other end of the first horizontal lever 42 to becapable of being horizontally rotated in both directions; and a secondhorizontal lever 45 provided with a cylinder 44 is fastened at one endthereof to the second rotation shaft 43. A pulley 46 is connected to adistal end of a piston rod 44 a of the cylinder 44 adjacent to the otherend of the second horizontal lever 45. A wheel dragging wire 47 issecured at one end thereof to the second horizontal lever 45 andconnected at the other end thereof to a wheel hanger 48. The wheeldragging wire 47 is partially wound on the pulley 46 and extendsdownward from the other end of the second horizontal lever 45.

[0036] The unexplained reference numeral 49 designates a control boxunit for synthetically controlling the drive motor 20 and the respectivecylinders.

[0037] In the drag type wheel finishing machine according to the presentinvention, constructed as mentioned above, if power is applied to startthe polishing and finishing operation, a predetermined amount ofabrasive polishing media is supplied into the abrasive polishing mediabath 30 placed on the lift plate 31, and then, wheels ‘w’ are mounted tothe respective wheel mounting parts 27 which are anchored to the lowerends of the upright members 24.

[0038] Describing a procedure for mounting the wheels ‘w’ to the wheelmounting parts 27 with reference to FIG. 1, the control box unit 49 ismanipulated to extend the piston rod 44 a out of the cylinder 44 tothereby lower the wheel hanger 48 connected to the other end of thewheel dragging wire 47 to the ground. Next, in a state wherein the wheelhanger 48 is hooked on the wheel ‘w’ which is moved adjacent to theframe structure 10, the cylinder 44 is operated to raise the wheel ‘w’.At this time, a worker grasps the wheel hanger 48 on which the raisedwheel ‘w’ is hung and moves the wheel hanger 48 to a position which isclose to the wheel mounting parts 27 by rotating the first and secondhorizontal levers 42 and 44 about the first and second rotation shafts41 and 43. Thereupon, by fitting the wheel ‘w’ around one of the wheelmounting parts 27, the wheel ‘w’ is mounted to the wheel mounting parts27.

[0039] If the wheels ‘w’ are mounted to the wheel mounting parts 27 inthe above-described way, the drag type hydraulic cylinder 37constituting the lift mechanism for the abrasive polishing media bath 30is operated. By this fact, as the piston rod 37 a of the drag typehydraulic cylinder 37 pulls the four wires 38 a through 38 d, theabrasive polishing media bath 30 is raised along with the lift plate 31.At this time, if the abrasive polishing media bath 30 is fully raised bythe drag type hydraulic cylinder 37, the wheels ‘w’ which are mounted tothe wheel mounting parts 27 coupled to the lower ends of the uprightmembers 24 are held partially submerged into the abrasive polishingmedia.

[0040] In this state wherein the wheels ‘w’ are held partially submergedinto the abrasive polishing media accommodated in the abrasive polishingmedia bath 30, as the drive motor 20 is actuated, the spindle 22 isrotated by way of the reduction gear box 21 of the drive motor 20. Withthis, the arms 23, the upright members 24 and the extended portion 22 awhich are integrated with the spindle 22 are also rotated.

[0041] Accordingly, as the wheels ‘w’ are revolved: along with theupright members 24, the wheels ‘w’ are polished through friction betweenthe wheels ‘w’ and the abrasive polishing media. Due to this frictionbetween the wheels ‘w’ and the abrasive polishing media, the wheels ‘w’are rotated about their respective wheel mounting parts 27. In otherwords, since the wheels ‘w’ are polished while being simultaneouslyrevolved and rotated, the entire surfaces of the wheels ‘w’ can beuniformly polished.

[0042] While the wheels ‘w’ are polished in this way, as the arms 23,the upright members 24 and the extended portion 22 a are rotated by thespindle 22, water which serves as one constituent of the abrasivepolishing media accommodated in the abrasive polishing media bath 30 isprimarily prevented from leaking by the presence of the flexible sealstrip 35 which are disposed between the abrasive polishing media bath 30and the doors 32. In spite of the sealing function rendered by theflexible seal strip 35, water overflowed onto the lower guide wall 33 bis returned into the abrasive polishing-media bath 30 through the hole34 which is defined in the lower guide wall 33 b. Therefore, leakage ofwater out of the abrasive polishing media bath 30 is avoided.

[0043] Further, since the rotation wings 22 b which are formed on theextended portion 22 a of the spindle 22 are also rotated, while thewheels ‘w’ mounted to the wheel mounting parts 27 coupled to the lowerends of the upright members 24 are rotated at a predetermined separationfrom the spindle 22, the abrasive polishing media collected toward thecenter of the abrasive polishing media bath 30 can be re-distributed inall directions, as a result of which uniform polishing of the wheels ‘w’can be ensured and a polishing time can be shortened.

[0044] In the course of polishing the wheels ‘w’, if the control boxunit 49 is manipulated to operate the upright hydraulic cylinders 26, aspiston rods of the upright hydraulic cylinders 26 are extended andretracted out of and into the upright hydraulic cylinders 26, theupright members 24 are rotated about the pins 25. Due to this fact,because the wheels ‘w’ mounted to the wheel mounting parts 27 coupled tothe lower ends of the upright members 24 are also rotated, it ispossible to rotate the wheels ‘w’ to an optimal angle with respect tothe arms 23. Therefore, since the friction between the wheels ‘w’ andthe abrasive polishing media bath 30 is effectively promoted, polishingefficiency of the wheels ‘w’ is improved, and due to this fact, it ispossible to complete the polishing and finishing operation within ashort period of time.

[0045] If the polishing and finishing operation for the wheels ‘w’ iscompleted, the control box unit 49 is manipulated so that the piston rod37 a of the drag type hydraulic cylinder 37 installed on the lift plate31 is extended out of the drag type hydraulic cylinder 37, by which thelift plate 31 is lowered along with the abrasive polishing media bath30. Thereafter, the wheels ‘w’ are dismounted using the wheel mountingcrane 40 from the wheel mounting parts 27 coupled to the lower ends ofthe upright members 24. A procedure for dismounting the wheels ‘w’ fromthe wheel mounting parts 27 using the wheel mounting crane 40 isperformed in a reverse order to the above-described wheel mountingprocedure.

[0046]FIG. 8 is a partial enlarge view illustrating a variation of thewheel mounting crane in the drag type wheel finishing-machine accordingto the present invention. In the wheel mounting crane, a crane body 50is arranged on the upper platform 13 of the frame structure 10 to becapable of being horizontally rotated in both directions. A quadricwheel moving lever 51 is installed on the crane body 50 to be pivoted inupward and downward directions. A crane cylinder 52 is secured to thecrane body 50 to pivot the wheel moving lever 51 in the upward anddownward directions, and a wheel gripper 53 is provided to a distal endof the wheel moving lever 51 to selectively grip the wheels ‘w’.

[0047] In the wheel mounting crane constructed as mentioned above,first, by operating the crane cylinder 52, the wheel gripper 53 israised or lowered to hold the wheel ‘w’. Then, by operating again thecrane cylinder 52, the wheel ‘w’ is raised. Next, as a worker pushes thewheel ‘w’ to a desired position, the crane body 50 is rotated, andthereby, it is possible to mount and dismount the wheels ‘w’ to and fromthe wheel mounting parts 27 of the upright members 24.

[0048] Industrial Applicability

[0049] As apparent from the above description, the drag type wheelfinishing machine according to the present invention, constructed asmentioned above, provides advantages in that a media bath along with alift structure is guided by four columns and supported by four wireswhich extend downward from upper ends of the respective columns, and oneends of the four wires are connected to a distal end of a piston rod ofa drag type hydraulic cylinder. Therefore, it is possible to stablymaintain the balance of the media bath.

[0050] Further, due to the fact that a sliding door is installed on themedia bath, space occupation can be diminished when opening and closingthe door. Therefore, a sufficient work space can be secured, and leakageof water between the media bath and the door is effectively prevented.Also, in the present invention, because upright members are connected toarms by means of pins and hydraulic cylinders connect the uprightmembers to distal ends of the arms, a wheel mounting angle, that is, awheel polishing angle can be adjusted, whereby it is possible to conducta polishing operation under a condition where friction between abrasivepolishing media and the wheels is maximized and an optimal polishingangle is maintained.

[0051] Moreover, in the present invention, by the fact that rotationwings are formed on a lower end of a spindle which is positionedcentrally of the plurality of upright members, while the wheels mountedto wheel mounting parts coupled to lower ends of the upright members arerevolved and rotated, the abrasive polishing media collected toward acenter of the media bath can be re-distributed in all directions,whereby the wheel polishing and finishing operation can be uniformlyimplemented.

[0052] Furthermore, since a crane which employs a cylinder is installedat a side of a frame structure, it is possible to simply andconveniently mount and dismount the wheels to and from wheel mountingshafts of the wheel mounting parts.

[0053] Although the preferred embodiments of the present invention havebeen disclosed for illustrative purposes, those skilled in the art willappreciate that various modifications, additions and substitutions arepossible, without departing from the scope and spirit of the inventionas disclosed in the accompanying claims.

1. A drag type wheel finishing machine in which a spindle extendingdownward is connected to and rotated integrally with a velocity-reducedoutput shaft of a drive motor secured to an upper platform of a framestructure, a plurality of arms horizontally extending in respective fourdirections are mounted adjacent to a lower end of the spindle, uprightmembers are joined to respective distal ends of the arms to extenddownward, wheel mounting parts for mounting wheels are mounted torespective lower ends of the upright members, and an abrasive polishingmedia bath is placed in the frame structure to be raised and lowered bya lift mechanism, wherein the lift mechanism of the abrasive polishingmedia bath is configured in a manner such that the abrasive polishingmedia bath can be raised and lowered while being guided by four columnsand supported by four wires extending downward from upper ends of therespective columns, and wherein one ends of the wires are connected to adistal end of a piston rod of a drag-type hydraulic cylinder installedon the abrasive polishing media bath in a manner such that, when thewires are simultaneously pulled via the piston rod, the abrasivepolishing media bath is raised.
 2. The machine as set forth in claim 1,wherein the arms and the upright members are connected with each otherby pins in a manner such that the upright members can be pivotedrelative to the arms, and upright hydraulic cylinders connect theupright members to the arms in a manner such that the upright memberscan be adjusted in their respective angular positions.
 3. The machine asset forth in claim 1, wherein a sliding door is installed on theabrasive polishing media bath to be guided in a circumferentialdirection while being opened and closed, upper and lower guide walls areformed on the abrasive polishing media bath to receive upper and lowerends of the sliding door, respectively, the lower guide wall has aY-shaped section which has a hole for allowing water that has overflowedonto the lower guide wall to be returned into the abrasive polishingmedia bath, and a flexible seal strip to be brought into contact withthe sliding door is affixed to an inner surface of the abrasivepolishing media bath to reduce an amount of water overflowing onto thelower guide wall.
 4. The machine as set forth in claim 1, whereinrotation wings are formed on the lower end of the spindle and extenddownward to reach the same level as the lower ends of the uprightmembers, in a manner such that, when the wheels mounted to the wheelmounting parts of the upright members are rotated, abrasive polishingmedia collected toward a center of the abrasive polishing media bath canbe redistributed in all directions.
 5. The machine as set forth in claim1, wherein the upper platform of the frame structure is provided with awheel mounting crane for mounting and dismounting the respective wheelsto and from the wheel mounting parts; and wherein the wheel mountingcrane comprises a first rotation shaft installed on the upper platformto be capable of being horizontally rotated in both directions, a firsthorizontal lever fastened at one end thereof to the first rotation shaftto extend in a horizontal direction, a second rotation shaft installedon the other end of the first horizontal lever to be capable of beinghorizontally rotated in both directions, a second horizontal leverfastened at one end thereof to the second rotation shaft and providedwith a cylinder, a pulley connected to a distal end of a piston rod ofthe cylinder adjacent to the other end of the second horizontal lever,and a wheel dragging wire having one end which is secured to the secondhorizontal lever and the other end which is connected to a wheel hanger,the wheel dragging wire wound on the pulley, and extending downward fromthe other end of the second horizontal lever.
 6. The machine as setforth in claim 1, wherein the upper platform of the frame structure isprovided with a wheel mounting crane for mounting and dismounting therespective wheels to and from the wheel mounting parts; and wherein thewheel mounting crane comprises a crane body arranged on the upperplatform to be capable of being horizontally rotated in both directions,a quadric wheel moving lever installed on the crane body to be pivotedin upward and downward directions, a crane cylinder secured to the cranebody to pivot the wheel moving lever in the upward and downwarddirections, and a wheel gripper provided to a distal end of the wheelmoving lever to selectively grip the wheels.